That sounds nice in theory, but most people do not get the concepts of sampling and resampling much at all, and are incapable of recognizing when resampling methods matter. For a lot of people, it won't make much difference in a majority of photos, so they are inclined to ignore the topic completely, but they may get burned when there is some fine periodic detail and it blows up on nearest neighbor. Sending an image to the printer at a PPI that doesn't cause resampling in the printer driver allows one to see a magnified view of the pixels that the printer is going to (try to) print. It isn't exactly the same, because ink bleeds randomly and there is usually dithering, but there is a pixel-to-pixel correspondence.